两相流细水雾灭B类火实验研究

Experiments on two-phase flow water mist extinguishing class B fire

采用气液同管雾状流输送方式,在两相流系统中设置雾化混合器,使结构简化。实验研究不同热释放率时两相流细水雾的灭火特性及规律。采用热电偶树和气体分析仪测量火焰温度及火场氧浓度,通过灭火时间评价细水雾的灭火效率,将两相流细水雾的灭火效果同单相流进行对比。实验结果显示,热释放率对细水雾的灭火效果影响显著;两相流在较低压力下就可达到单相流较高压力的灭火效果。

In the two-phase system,the spray mixer was set by means of mist flow transporting with gas and liquid in the same tube,so as to simplify the structure.The fire extinguishing characteristics and rules of two-phase flow water mist under different heat release rate conditions were studied by experiments.Thermocouple tree and gas analyzer were used to measure the flame temperature and oxygen concentration around the flame.The fire extinguishing efficiency was evaluated by fire extinguishing time.The effect of two-phase flow water mist was compared to the single stream.Results showed that the heat release rate greatly affects the fire extinguishing efficiency of water mist;two-phase flow water mist can achieve the fire extinguishing efficiency in lower pressure,while the single stream needs higher pressure.